Journal
CARBOHYDRATE POLYMERS
Volume 98, Issue 1, Pages 43-49Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.04.065
Keywords
Wheat B-starch; alpha-Amylase; Acetylated maltodextrin; Uniformity
Categories
Funding
- Biodegradable composites based on B-starch for agriculture applications Research Grant [GACR 525/09/0607]
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Wheat B-starch was hydrolysed by alpha-amylase Liquozyme supra from Bacillus licheniformis at 90 degrees C and pH 7. After 2 h, the dextrose equivalent was 18; according to size exclusion chromatography, however, the hydrolysate contained not only dominant malto-oligosaccharides with the degree of polymerisation (DP) < 10 but also more than 20% of components with DP higher than 40. The product was acetylated to a high degree as verified by FTIR and H-1 NMR (degree of substitution DS = 3.1); nevertheless, detailed analysis of the MALDI-TOF mass spectra of the product showed that most of the malto-oligosaccharides molecules contained one or two residual hydroxyls. Size exclusion chromatography confirmed that the acetylated maltodextrin still contained a significant part with DP > 40. This non-uniformity of acetylated maltodextrin, both with respect to DP and to DS, must be taken into account in the development of acetylated-maltodextrin applications such as use as plasticisers or compatibilisers in biodegradable composites. (C) 2013 Elsevier Ltd. All rights reserved.
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